Surface topography of operated slide journal micro - bearings used in HDD

• Autorzy: Miszczak A.
• Języki publikacji: EN

Abstrakty

EN

In this paper author present results of measurements of slide journal micro-bearings surface topography measured with an atomic force microscope (AFM). The results of measurements of surface topography were presented in the form of surface topography maps, three-dimensional graphs and some examples of selected cross-sections of investigated surface in the form of profile graphs. Measurements of surface topography were made for journals and sleeves of slide journal micro-bearings from personal computers' hard disc drives, with the Atomic Force Microscope NT-206 produced in MTM in Minsk, Republic of Belarus. In this research author used two identical sets of micro-bearings from 2.5" HDD Samsung HM160HI 5400rpm and 3.5" HDD Seagate Barracuda 7200.10 ST380815AS 7200 rpm hard disc drives. First set of those four microbearings worked for a year at rated RPM continuously (i.e. 24 hours a day). Second set of the same micro-bearings also worked for a year at rated RPM, but in intermittent mode (i.e. 15 minutes on, 15 minutes off). The values of profile roughness parameters Ra and Rq and the distance between maximum peak height and maximum valley depth are presented as well. The application SurfaceXplorer registered trademark was used for processing and visualization of the data obtained from AFM NT-206, which besides from generating 2D, 3D and profile diagrams, was used to calculate and draw graph of height distribution. Surface topography of investigated bearings sleeves was also measured using Hommeltester T8000-R60 profilometer. Those measurements give information about micro-grooves dimensions and location. On the surfaces of studied micro-bearings, some micro-grooves can be found in form of herringbone, with depth about 1.5..m and width 150..m. Received information about micro-grooves geometry will allow developing proper theory of hydrodynamic lubrication for micro-bearings with micro-grooves.

Słowa kluczowe

EN

atomic force microscope; surface topography; microgrooves; herringbone grooves; micro bearing in HDD

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2012
• Tom: Vol. 19, No. 4
• Strony: 449--456
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Miszczak A.

• Gdynia Maritime University, Faculty of Marine Engineering Morska Street 83, 81-225 Gdynia, Poland tel.: [phone], fax number: [phone],

Bibliografia

• [1] Andharia, P. I., Deheri, G. M., Gupta, J. L., Effect of Longitudinal surface Roughness on the Behaviour of Squeeze Film in a Spherical Bearing, International Journal of Applied Mechanics and Engineering, Vol. 6, No. 4, pp. 885-897, 2001.
• [2] Asada, T., Saito, H., Asaida, Y., Itoh, K., Design of hydrodynamic bearing for height-speed HDD, Microsystem Technologies, 8, pp. 220-226, 2002.
• [3] Chizhik, S., Khudoley, A., Kuznetsova, T., Wierzcholski, K., Miszczak, A., Micro and Nanoscale Wear Studies of HDD Slide Bearings By Atomic Force Microscopy, Proceedings of Methodological Aspects of Scanning Probe Microscopy, Heat and Mass Transfer Institute of NAS, pp. 247-252, Minsk 2010.
• [4] Czaban, A., Miszczak, A., Surface Topography on Non-Operated Slide Journal Micro- Bearings, Journal of KONES Powertrain and Transport, Vol. 18, No. 2, pp. 109-115, 2011.
• [5] Gururajan, K., Prakash, J., Surface Roughness Effects in Infinitely Long Porous Journal Bearings, Transactions of the ASME, Journal of Tribology, Vol. 121, pp. 139-147, 1999.
• [6] Jang, G. H., Lee, S. H., Kim, H. W., Kim, C. S., Dynamic analysis of a HDD spindle system with FDBs due to the bearing width and asymmetric grooves of journal bearing, Microsystems Technologies, 11, pp. 499-505, 2005.
• [7] Jang, G. H., Seo, C. H., Ho Scong Lee, Finite element model analysis of an HDD considering the flexibility of spinning disc-spindle, head-suspension-actuator and supporting structure, Microsystem Technologies, 13, pp. 837-847, 2007.
• [8] Miszczak, A., Analiza hydrodynamicznego smarowania ferrocieczą poprzecznych łożysk ślizgowych, Monografia, Fundacja Rozwoju Akademii Morskiej, Gdynia 2006.
• [9] Wierzcholski, K., Miszczak, A., Adhesion Influence on the Oil Velocity and Friction Forces in Cylindrical Microbearing Gap, Scientific Problems of Machines Operation and Maintenance, Polish Academy of Sciences, Z. 1(161), Vol.45, pp.71-79, Radom 2010.
• [10] Wierzcholski, K, Miszczak, A., Khudoley, A., Characterization of nano-grooved superficial layer of computer microbearings, Tribologia, 6, pp. 257-267, Radom 2011.
• [11] Wierzcholski, K., Miszczak, A., Load carrying capacity of microbearing with parabolic journal, Solid State Phenomena, Trans Tech Publications, Vols. 147-149, pp. 542-547, Switzerland, UK, USA 2009.